<?php

if (! defined ( 'BASEPATH' ))
	exit ( 'No direct script access allowed' );
/**
 * CodeIgniter
 *
 * An open source application development framework for PHP 5.1.6 or newer
 *
 * @package		CodeIgniter
 * @author		ExpressionEngine Dev Team
 * @copyright	Copyright (c) 2008 - 2011, EllisLab, Inc.
 * @license		http://codeigniter.com/user_guide/license.html
 * @link		http://codeigniter.com
 * @since		Version 1.0
 * @filesource
 */

// ------------------------------------------------------------------------


/**
 * Parser Class
 *
 * @package		CodeIgniter
 * @subpackage	Libraries
 * @category	Parser
 * @author		ExpressionEngine Dev Team
 * @link		http://codeigniter.com/user_guide/libraries/parser.html
 */
class CI_Parser {
	
	var $l_delim = '{';
	var $r_delim = '}';
	var $object;
	
	/**
	 * Parse a template
	 *
	 * Parses pseudo-variables contained in the specified template view,
	 * replacing them with the data in the second param
	 *
	 * @access	public
	 * @param	string
	 * @param	array
	 * @param	bool
	 * @return	string
	 */
	public function parse($template, $data, $return = FALSE) {
		$CI = & get_instance ();
		$template = $CI->load->view ( $template, $data, TRUE );
		
		return $this->_parse ( $template, $data, $return );
	}
	
	// --------------------------------------------------------------------
	

	/**
	 * Parse a String
	 *
	 * Parses pseudo-variables contained in the specified string,
	 * replacing them with the data in the second param
	 *
	 * @access	public
	 * @param	string
	 * @param	array
	 * @param	bool
	 * @return	string
	 */
	function parse_string($template, $data, $return = FALSE) {
		return $this->_parse ( $template, $data, $return );
	}
	
	// --------------------------------------------------------------------
	

	/**
	 * Parse a template
	 *
	 * Parses pseudo-variables contained in the specified template,
	 * replacing them with the data in the second param
	 *
	 * @access	public
	 * @param	string
	 * @param	array
	 * @param	bool
	 * @return	string
	 */
	function _parse($template, $data, $return = FALSE) {
		if ($template == '') {
			return FALSE;
		}
		
		foreach ( $data as $key => $val ) {
			if (is_array ( $val )) {
				$template = $this->_parse_pair ( $key, $val, $template );
			} else {
				$template = $this->_parse_single ( $key, ( string ) $val, $template );
			}
		}
		
		if ($return == FALSE) {
			$CI = & get_instance ();
			$CI->output->append_output ( $template );
		}
		
		return $template;
	}
	
	// --------------------------------------------------------------------
	

	/**
	 * Set the left/right variable delimiters
	 *
	 * @access	public
	 * @param	string
	 * @param	string
	 * @return	void
	 */
	function set_delimiters($l = '{', $r = '}') {
		$this->l_delim = $l;
		$this->r_delim = $r;
	}
	
	// --------------------------------------------------------------------
	

	/**
	 * Parse a single key/value
	 *
	 * @access	private
	 * @param	string
	 * @param	string
	 * @param	string
	 * @return	string
	 */
	function _parse_single($key, $val, $string) {
		return str_replace ( $this->l_delim . $key . $this->r_delim, $val, $string );
	}
	
	// --------------------------------------------------------------------
	

	/**
	 * Parse a tag pair
	 *
	 * Parses tag pairs:  {some_tag} string... {/some_tag}
	 *
	 * @access	private
	 * @param	string
	 * @param	array
	 * @param	string
	 * @return	string
	 */
	function _parse_pair($variable, $data, $string) {
		if (FALSE === ($match = $this->_match_pair ( $string, $variable ))) {
			return $string;
		}
		
		$str = '';
		foreach ( $data as $row ) {
			$temp = $match ['1'];
			foreach ( $row as $key => $val ) {
				if (! is_array ( $val )) {
					$temp = $this->_parse_single ( $key, $val, $temp );
				} else {
					$temp = $this->_parse_pair ( $key, $val, $temp );
				}
			}
			
			$str .= $temp;
		}
		
		return str_replace ( $match ['0'], $str, $string );
	}
	
	// --------------------------------------------------------------------
	

	/**
	 * Matches a variable pair
	 *
	 * @access	private
	 * @param	string
	 * @param	string
	 * @return	mixed
	 */
	function _match_pair($string, $variable) {
		if (! preg_match ( "|" . preg_quote ( $this->l_delim ) . $variable . preg_quote ( $this->r_delim ) . "(.+?)" . preg_quote ( $this->l_delim ) . '/' . $variable . preg_quote ( $this->r_delim ) . "|s", $string, $match )) {
			return FALSE;
		}
		
		return $match;
	}

}
// END Parser Class

/* End of file Parser.php */
/* Location: ./system/libraries/Parser.php */
